My 7 year old refuses to attend school, even to the extend of lying?

I'm a busy mother trying to juggle work and sending my kids to school (2 of them). I ain't got much time with them as I hold two jobs and work throughout the week. Hated it...but we ain't rich. Lately, my son refuses to attend school, have to drag him out of the car....only to receive a call from school that he refuses to go into cl. Please help...tried coaxing, scolding...but to no avail